Work done by Conservative force is Positive,

Can I say Kinetic Energy increases?

Potential energy of a body is its capacity to do work by virtue of its position in a conservative forcefield.So if the body is free to move it will do so in such a way as to reduce its potential energy and the reduction in the potential energy will be equal to the positive work done by the body.
So, if work done by conservative force is positive, then kinetic energy of body will increase. This is because the potential energy decreases and an equal amount of rise would occur in kinetic energy because of law of conservation of energy.