My wife is in Xiamen.she is working there as sales marketing.i want to visit her this coming.

You are eligible to apply for a family visit L visa to China, but first get invitation letter from your wife first, as well as other documents like marriage contract and birth certificate of your son, copies of your wife's work visa and residence permit. You can check https://www.travelchinaguide.com/embassy/visa-application-philippines.htm for more details.