Which are the factor that affect Permeability of Soil ?

Permeability of soil is an important property of soil study as a civil engineering point of view.

Permeability of a soil is the property to allow water to pass from a series of pores.

Following are some factors which affect the permeability

1. Shape and size of the soil particles
2. Temperature and climatic conditions
3. Degree of saturation of soil
4. The specific surface area of the particles present in the soil
5. Void ratio of soil
6. Properties of water absorption
7. Nature of soil
8. Mechanical properties of soil
9. Characteristics of expansion and contraction

But I recommend you to read details about all the above properties from the article:

https://test.theconstructor.org/geotechnical/factors-affecting-soil-permeability/29563/