I strongly disagree with the idea that China is secretly pro Israel. The People's Republic threw off its foreign concessions and regained Hong Kong and Macau from the imperialists, while Israel is the west's final colonial occupation. It must fall as the last vestige of the west's imperialism, like South Africa, Rhodesia and South Vietnam, like Taiwan must be reunified and the Korean peninsula must be de-Americanized. I however do regard the liberation of Palestine not as the responsibility of China, but of other closer anti-imperialist states such as Iran, Afghanistan(a little far) and Syria.
While China should support Palestinian liberation, direct intervention would simply create a South Vietnam scenario, the side with direct involvement lost, while the side who simply supplied weapons and support succeeded. Palestine can be better helped by helping Iran, strengthen Syria, ending the Gaza blockade, etc.