Detailed velocity distribution as well as the profiles of the mean velocities and volume fraction of the particles in a flow of gas-solid mixture through horizontal channel, are determined using the high speed particle tracking velocimetry, for various combinations of solid mass loading ratios and superficial gas velocities. Spherical glass particles of two different sauter mean diameters are used in the experiment. The smaller particles are better dispersed in the channel than the larger ones. Also, the lower mass loading ratio and higher gas velocity result in more homogeneity in the flow. Particles are observed to accumulate at the bottom of the channel as the mass loading ratio is increased for reduced gas velocities. The distribution of the stream-wise velocity is negatively skewed whereas that of the cross-stream component of the velocity is symmetric. The tail of the distribution is non-Gaussian in nature. (C) 2016 Elsevier B.V. All rights reserved.