The classic“Gilbert”delta is not a sole type of lake basin deltas

because the lake basin deltas though differ from those of marine basin in properties

they still have many common properties.Especially in particular situation

the deposition of deltas in marine basin is also an innegligible factor for lake basin deltas.The density of the water body of lake basins is close to that of rivers

but it may differs greatly from the river's or even exceeds that of marine basin.The effects of river of course played a decisive role in the formation of the lake basin deltas

but the effects of wave are very important.The transgression and regression of lake water even surpassed those of marine basin.Those deltasin special

such as steep slope deltas

transgres sive deltas of normal cycle andwave controlled deltas which are discovered in paleo-sediments and present sediments in succesion have provided material base for the classification in thispaper.In accordance with the combinations of the steepness or gentleness of slopes

transgression or regression of lakes and the controlling of waves or rivers

lake basin deltas can be divided into 8 end types so as to reveal their origin.