Xi, who is also general secretary of the Communist Party of China (CPC) Central Committee and chairman of the Central Military Commission (CMC), underscored the importance of improving combat readiness through troop training.
He made the comments Monday while visiting the 65th Army Group, which is stationed in north China's Hebei Province.
At the barracks, he extended Spring Festival greetings to the armed forces, armed police force, the militia and reserve forces.
He encouraged all soldiers to carry forward the country's excellent traditions and move with the times, while using the party's new theories to arm their ideologies.
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Xi was concerned about soldiers' living arrangements during the Chinese Lunar New Year, which falls on January 28.
He was briefed by a platoon leader that soldiers will have dinner, play games and attend entertainment events.
After listening to the soldiers singing, Xi sat with them, talking to every soldier in the platoon, urging the leaders to make sure that the soldiers have a good Spring Festival, state-run Xinhua news agency reported.
At the command and training centre of the army group, Xi ordered better ideological and political work, saying that the pernicious influence of Guo Boxiong and Xu Caihou, two corrupt former CMC vice chairmen, should be purged.
It must be ensured that the military upholds the authority of the CPC Central Committee at all times and under any circumstances, and firmly follows the command of the CPC Central Committee and the CMC, Xi said.
He demanded reform tasks be implemented and the military's combat capability be enhanced through drills under battle conditions.
While striving to complete military missions, Xi said, the military should also support the integrated development of the Beijing-Tianjin-Hebei region and the country's poverty alleviation effort.