There are two paths:All paths to Syria are through countries with American military bases or NATO members.
Thus there is no realistic way for Chinese troops to reach Syria to intervene, even if it were a good idea.
1. Through Russia
2. By sea
1. Aircraft could use Russia as a route to Syria
The Russians would have no reason to refuse Chinese aid, just as Assad would have no reason to refuse Chinese aid. Allowing China to fly over the country to reach Syria would be a path worth considering
2. Warships and support vessels sent could use the base in Djibouti as a transit point to reach Syria
The Chinese military inflection point would now be able to reach the Mediterranean (access to naval bases in Syria) while maintaining the military base in Djibouti as a support point