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Over the past decades, direct imaging has confirmed the existence ofsubstellar companions (exoplanets or brown dwarfs) on wide orbits (>10 au) fromtheir host stars. To understand their formation and evolution mechanisms, wehave initiated in 2015 the SPHERE infrared survey for exoplanets (SHINE), asystematic direct imaging survey of young, nearby stars to explore theirdemographics.} {We aim to detect and characterize the population of giantplanets and brown dwarfs beyond the snow line around young, nearby stars.Combined with the survey completeness, our observations offer the opportunityto constrain the statistical properties (occurrence, mass and orbitaldistributions, dependency on the stellar mass) of these young giant planets.}{In this study, we present the observing and data analysis strategy, theranking process of the detected candidates, and the survey performances for asubsample of 150 stars, which are representative of the full SHINE sample. Theobservations were conducted in an homogeneous way from February 2015 toFebruary 2017 with the dedicated ground-based VLT/SPHERE instrument equippedwith the IFS integral field spectrograph and the IRDIS dual-band imagercovering a spectral range between 0.9 and 2.3 $\mu$m. We used coronographic,angular and spectral differential imaging techniques to reach the bestdetection performances for this study down to the planetary mass regime.}

The SPHERE infrared survey for exoplanets (SHINE) -- II. Observations, Data reduction and analysis Detection performances and early-results