“平均地权论” can be translated as "the Theory of Equalization of Land Rights" or "the Doctrine of Equalizing Land Ownership".
Here's a brief explanation:
"平均地权" (píngjūn dìquán) literally means "equalizing land rights" or "averaging land ownership," which was a key economic policy proposed by Sun Yat-sen (Dr. Sun Zhongshan) as part of his Three Principles of the People (民族主义、民权主义、民生主义, or Nationalism, Democracy, and People's Livelihood).
"论" (lùn) means "theory" or "doctrine," so combining them gives the above translations.
The first translation ("the Theory of Equalization of Land Rights") is more literal and commonly used in academic contexts, while the second ("the Doctrine of Equalizing Land Ownership") emphasizes the ownership aspect and is also acceptable.