It won't affect. The application for joining the Party is an important document, which needs to be filled in carefully by the applicant, but it is understandable that clerical errors occasionally occur. If you make a mistake, you'd better write the correct word beside or below it after crossing out the wrong word, and sign or seal the correction place for confirmation. This will show that you are serious about the application and ensure that the correct content is clearly visible. However, in order to avoid any potential problems, it is best to carefully check and proofread the application form before submitting it to ensure the accuracy and completeness of all information.