Whether an Amazon purchase contract in Chinese and English is needed depends on the specific situation and the communication and negotiation between the two parties.

Here are some considerations:

1. Language proficiency of both parties: If both parties can understand and use Chinese and English fluently, then a Chinese-English contract may be an option to better communicate and understand the terms of the contract.

2. Legal requirements: Depending on the laws and regulations applicable to the contract, there may be requirements for the language of the contract. For example, certain regions or industries may require that the contract must be in a specific language.

3. International trade: If the purchase involves international cooperation or cooperation with overseas suppliers, using Chinese and English contracts can ensure that both parties can understand the content of the contract and reduce misunderstandings or disputes caused by language barriers.

4. Place of execution of the contract: The place of execution of the contract may also affect the choice of language. If the contract is executed in a region where Chinese is mainly used, a Chinese contract may be more convenient to operate and execute.

The final decision should be based on the willingness, communication ability and specific business needs of both parties. Before signing the contract, both parties can discuss and determine the most suitable language version, or they can choose to provide both Chinese and English versions of the contract to ensure that both parties can clearly understand the terms of the contract.

No matter which language is used, the content and terms of the contract should be clear and accurate, and reviewed by professional legal advisors to ensure the legal effect of the contract and the rights and interests of both parties. If there are any questions about the language or other aspects of the contract, it is recommended to consult legal professionals.