Can China people change their passports if they travel in Ecuador for more than 90 days?

Of course. If a party's passport expires abroad, he may apply to the embassy of China for a new passport. According to the provisions of China's Passport Law, passport holders who apply for renewal or replacement of ordinary passports abroad shall submit them to the people of China, China's embassies and consulates abroad or other overseas institutions entrusted by the Ministry of Foreign Affairs.