I m a filipino passport holder, how can I get visa to China for tourism?

You can apply for China tourist visa L from Chinese embassy or consulate over your area of residence in Philippines. If your kids are below 18 years old, they need to secure a travel clearance from the Department of Social Welfare and Development. If, however, the minor is traveling with you only, your husband shall execute a duly-notarized Parental Travel Permit (in a form prescribed by DSWD) certifying that he is allowing the minor to travel with you.
You can read https://www.travelchinaguide.com/embassy/visa-application-philippines.htm for more details.

You can also check on this website from the Chinese Embassy in the Philippines: http://ph.china-embassy.org/eng/lsfw/hzqz/t171818.htm