For an introduction to domestic political science, see Wang Huiyan's Principles of Political Science.
There are Andrew Heywood and Michael Ruskin abroad.
Classic works:
Utopia (Plato) and Politics (Aristotle) in Ancient Greece.
Works from the Renaissance to the Enlightenment, such as
Monarch (Machiavelli)
War and Peace Act
On the Government (Locke)
On the Spirit of Law (Montesquieu)
On Social Contract (Rousseau)
Marxist political science has some literary theories to read.
The Commercial Press has a set of Chinese Translation Series of World Academic Masterpieces, with a relatively complete bibliography.