The CCP used a warfare tactic called Guerilla Warfare which was well suited to hilly and forested areas such as Manchuria. This strategy had been perfected against Japan.
The CCP had tactical flexibility meaning they conceded when faced with superior force. For example, a tactical retreat was used in Yan'an 1946.
Morale among CCP forces was high due to the ideaological aspect of their training. The forces helped spread communist propoganda.
From 1928, Mao had impressed civilian respect and proper discipline among his forces.
Lin Biao began using conventional warfare tactics from 1947; lauching full-frontal attacks.
Jiang Jieshi had sent his best troops to Manchuria leaving Central and Northern China undefended.
NRA commanders had very poor planning strategies in terms of supplies and stole money intended for soldiers
Jiang had become more suspicious of independent thinkers so was trying to manage the entire war effort making his leadership impractical.
The GMDs mainly conscript army was regularly left without food or water for days. This led to desertees and low morale
When taking over areas controlled by CCP, the GMD gained a reputation for being brutal and ill-disciplined.
Mao encourage political unity by only allowing debate among top officials and strictly enforcing Mao Zedong thought in lower ranks
The CCP had created democratic dictatorship by allowing low-level peasants to particpate in revoloutionary comitees. These dealt with farming, healthcare and education.
Land reform helped garner peasant support for the CCP and they became so violent that by early 1948, it became so violent that mebers began to campaign for restraint.
Throughout the war, the base of communist support broadened as middle classes were drawn to the patriotism from fighting Japan.
The GMD had failed to deliver on the three promises of Sun Yat-Sen so were losing support.
The GMD had severly mismanaged the economy and there was inflation among the middle class. In 1949, there was economic collapse in nationalist controlled areas.
American assitance to the GMD number $3 billion but Mao used it to point out how the GMD needed international help to rule.
Aid for GMD began to fade when Truman was elected in November 1948
The Red army established 16 training academies and provided military equipment for the CCP.
Japanese arms, equiupment and soldiers were handed over to the CCP by Russia to aid their war effort
The long standing animosity between Mao and Stalin prevented their full cooperation during the Civil War. Stalin always put his own intrest over benefit for China.