Will joining the party affect going abroad and immigration? "

Moreover, there is no such requirement in the relevant forms you fill out when applying for a visa;

Moreover, personal political beliefs are fully respected in western countries;

Therefore, it doesn't matter whether the applicant is from party member or China.

Don't fill in your organization in the application form. There is not so much pressure now. It has no effect on studying abroad and immigration.

There is a column in the immigration application form that asks if you have joined any "organizations". You can leave it blank. At least I know there will be no problem immigrating to Canada and Australia.