入境有效期
 签证的入境有效期，是指持证人所持签证入境的有效时间范围。非经签发机关注明，签证自签发之日起生效，于入境有效期满当日北京时间24:00失效。只要入境次数仍有剩余，在入境有效期满前的任何时候，持证人均可持此签证赴中国。入境有效期已过的签证，无论是否剩余入境次数，均无法使用。
中国驻外使领馆不能延长签证的入境有效期。如果签证失效，请重新申请签证。持用失效签证前往中国，将被拒绝入境。因此，出发去中国前，请再次检查签证的入境有效期。请注意，即使外国人持有有效的中国签证，也可能被中国出入境管理部门拒绝入境。
例如：
问：我的签证入境次数为两次，入境有效期至6月20日。我已于6月12日第一次使用该签证入境中国。可否于6月25日再次使用该签证前往中国？
答：不可以。因为该签证的入境有效期已过，即使仍有剩余的入境次数，您也无法再次使用。
 
入境次数
签证的入境次数，是指持证人在签证的入境有效期内可以入境的次数。入境次数用完，签证即失效；即使入境次数未用完，如果入境有效期已过，签证亦失效。如需再次前往中国，须重新申请签证。持用入境次数已用完的签证前往中国，将被拒绝入境。
例如：
问：我的签证入境次数为两次，入境有效期是3月20日至6月20日。我已于5月20日前入境中国两次。能否在6月20日前继续使用该签证？
答：不能。因为该签证的入境次数已用完，即使该签证尚在入境有效期内，您也无法继续使用。      
 
停留期限
 签证的停留期限，是指持证人每次入境后被准许停留的时限，自入境日开始计算。
例如：
问：我的签证入境次数为一次，停留期限为30天。我计划于6月12日入境中国，在中国最长可以停留至几月几日？
答：您在中国最长可以停留至7月11日。因为签证停留期限是自入境日（6月12日）开始计算，最长可以停留30天，至7月11日。
例如：
问：我的签证入境次数为一次，停留期限为30天，入境有效期至6月12日。如果我于签证的入境有效期最后一天，即6月12日，入境中国，可否在中国停留30天？
答：可以。
如在中国停留需超过签证允许的停留期限，当事人必须在当地公安机关规定的期限内提出申请延期。可以申请并不等于申请一定会被批准，由此可能引起的一切责任应由申请人承担。
在中国停留超过签证停留期限，将违反外国人出入境管理法规，并会被处以罚款等处罚。
 
Validity period of entry
The entry validity period of a visa refers to the valid time range for entry of the visa held by the holder. The visa shall take effect from the date of issuance and shall expire at 24:00 Beijing time on the day when the entry validity period expires without the indication from the issuing authority. The holder of the permit may travel to China with this visa at any time before the expiration of the entry validity period as long as the number of entry times still resides. Visas that have passed the validity period of entry cannot be used regardless of the remaining number of entry.
Chinese embassies and consulates abroad cannot extend the entry validity of visa. In case the visa expires, please re-apply for the visa. Going to China with an invalid visa will be denied entry. Hence, please check the entry validity of the visa again before leaving for China. Please note that even in case foreigners hold valid China visas, they may be denied entry by the Chinese exit-entry authorities.
For example:
Q: The number of times my visa enters the country is twice. The entry is valid until June 20. I first used the visa to enter China on June 12 th. Can you use the visa again to go to China on June 25 th?
Answer: No. You cannot use it again even if there are the remaining times of entry since the entry validity of the visa has expired.
Number of Entry
The number of entry times on a visa refers to the number of times that the holder can enter the country during the entry validity period of the visa. When the number of entry times is used up, the visa will expire; The visa will become invalid if the entry validity period has passed even if the number of entry times has not been used up. In case you need to travel to China again, you must re-apply for a visa. Visa to China that has been used up several times of entry will be denied entry.
For example:
Q: I have entered the country twice on a visa, and the entry period is valid from March 20 to June 20. I have entered China twice before May 20. Can I continue to use the visa before June 20 th?
Answer: No. You cannot continue to use the visa because it has been used up even during the entry period.
Stay Duration
The stay period of a visa refers to the time limit during which the holder is allowed to stay after each entry is calculated from the date of entry.
For example:
Q: The number of times I enter the country on a visa is once and the stay period is 30 days. I plan to enter China on June 12 th, and I can stay in China for a maximum of several months?
Answer: You can stay in China up to July 11 th. Since the visa stay period is calculated from the entry date (June 12), it can stay for a maximum of 30 days until July 11.
For example:
Q: The number of times my visa enters the country is one time, the stay period is 30 days, and the entry is valid until June 12. In case I enter China on the last day of entry validity of my visa, June 12, can I stay in China for 30 days?
Answer: OK.In case the stay in China is required to exceed the stay period allowed by the visa, the party must apply for an extension within the time limit stipulated by the local public security organ. The availability of an application does not necessarily mean that the application will be approved, and all responsibilities that may be arising therefrom shall be borne by the applicant.
It will violate the entry and exit regulations of foreigners and will be punished by penalties such as penalties for staying in China in excess of the visa stay period.