Senior leader Li Changchun has called upon members of the Communist Party of China (CPC) to uphold the principle of serving the people while pushing forward the sinicization of Marxism with strengthened theoretic studies.

Li, member of the Standing Committee of the Political Bureau of the CPC Central Committee, made the remarks Saturday at a seminar to commemorate the 90th founding anniversary of the CPC.

Researchers on Party theories should strengthen their sense of responsibility and make more efforts in sinicizing Marxism and making the theory more up-to-date and popular, Li said.

CPC members were also urged to provide solid theoretic support for the country's scientific development and use Party theories to guide and mobilize ordinary people.

On Friday, the CPC Central Commission for Discipline Inspection (CCDI) also held a group study to mark the CPC's 90th anniversary.

At the meeting, He Guoqiang, head of the CCDI, called upon discipline inspection and supervision departments at all levels to carefully study the speech delivered by President Hu Jintao on Friday at a grand gathering marking the 90th founding anniversary of the CPC.

He, also member of the Standing Committee of the Political Bureau of the CPC Central Committee, urged members of these departments to adapt the spirits of Hu's speech to their daily work and constantly push forward the anti-corruption fight while the CPC strives to build a clean Party.