According to China's trip to official website. Com, Ping An Pratt & Whitney plagiarized the same signature is invalid. In the contract, the main contract states that it contains annexes, so the annexes have the same effect as the main contract. Even if it is unsigned or so-called "repeated signature", the contract is still valid. However, in the case that the two parties did not agree on the terms of the contract, the lender signed it himself, and the effectiveness of the signature was obviously flawed.