“The beauty and clearness of the concordance cosmology, which fits most of the observational data, is at present obscured by two clouds.” This is a modified version of Lord Kelvin’s speech in 1900. The two dark clouds of modern cosmology are dark matter and dark energy, which we still do not have a clue today what they are. However, with the help of large astronomical surveys, we are able to probe the large scale properties of dark matter and dark energy. One of the measurements is based on weak gravitational lensing, a statistical measurement connecting the linear distortion of background galaxies and the intervening dark matter potential traced by galaxies and clusters of galaxies between the observer and background sources. We do confirm the assumption that the mass of the dark matter halos around galaxies increases as a function of the luminosity, stellar mass of galaxies. We also use the weak lensing signals around clusters given a certain abundance to constrain the phenomenological parameters in a cosmology where dark matter and dark energy interact with each other. As the advent of Vera Rubin telescope and EUCLID space telescope, both of which take weak lensing as one the key projects will pin down the statistical error below 1% level. We expect weak gravitational lensing will play a more important role in the coming years.